Looper mechanism for sewing-machines.



. H. BRIGGS. LOOPER MECHANISM FOR SEWING MACHINES.-

' APPLICATION FILED AUG. 5, 1905.

1,030,804, Patented June 25,1912.

W llllllll1l iil l l i To all whom it may concern:

.with a peripheral "unrrn HENRY BRIGGS, 0F HASBROUCK HEIGHTS/NEW JERSEY,

MACHINERY, COMPANY, OF E'ATERfiON, NEW JERSEY,

rmsniz.

ASSIGNOR T0 UNITED SHOE A CORPORATION OF NEW LOOBEB nncnamsm non snwme-macmuns.

: speetflcationpt letters Patents Patented June 25, 191 2.

Application and August 5,-1905. Serial No. 272,818.

"Be it known thahI, HENRY Barons, a citizen of the United States,residing at Hasbrouck Hei hts, in the county of Bergen and State 0NewJersey, have invented certainnew and useful Improvements in LooperMechanism for Sewing-Machines; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it ap'p'ert-ains to make anduse the same.

The present invention relates to improve ments 1n looper mechanismsforsewing machines.

In sewing machines ofthetype in which i a hooked or barbed needle isemployed the thread is delivered to the needle by a device called alooper, which performs at each stitch an oscillation or a rotarymovement, aboutthe' needle for this purpose. in machines of this typeprovidcd'with a thread finger, the looper usually has a further movementto deliver thread to the thread finger.

In order to impart to the looper the movements above described, it iscommon, as, for example, in the well known Goodyear shoe sewing machine,to mount the looper on a lever, called a looper carrier, which is pivoted on a fulcrum permitting a universal oscillating movement of thelooper carrier, and to actuate the looper carrier by a cam engaging camrolls journaled on the looper carrier, The cam is provided with aperipheral oove which imparts lateral vibrations- 0 the looper carrierand looper, and

cam surface which imparts forward and backward oscillations to thelooper carrieriand looper, the times and amplitudes of th severaloscillatory movements being so arranged as to produce in combination theproper movement of the 'looper about the needle.

The peripheral cam surface above described actuates the looper carrierpositively in one direction, but to keep the cam rolls in contact withthis surface and to actuate the looper carrier in the opposite directionit has been customary to. use a spring, connected to the looper carrierand to a fixed part of the machine. This construction is defective forseveral reasons. The time in the cycle of operations of the machineassigned to the operation of the looper is necessarily short, andconsequently the parts of the cam paths producing the looping movementsare rather abruptly curved, and

when the machine is operated at high speed the cam rolls bearing on theperipheral cam surface tend to jump across the depressions thereinunless the spring is of excessive strength, so, that the movements ofthe looper are not properly performed and the cam mechanism is noisyand'wears rapidly. Moreover, the use of a constantly acting springimposes constant wear on the journals of the cam rolls and the cam, andcauses waste of power in the machine.- i

The object of the present invention is to produce a looper mechanism inwhich the obyections noted above are obviated, and to this end'theinvention consists in a looper mechanism in which a looper carriermounted on a universal fulcrum inthe manner above described is providedwit-h the mechamsm hereinafter described for positively actuating thelooper carrier and looper in every d rection,'so that the action of thelooper is rendered certain and positive.

The invention is illustrated as applied to a shoe sewing machine of theWell-known Goodyear type, and as such machines are familiar to thoseskilled in the art only so 7 much thereof is shown as is necessary foran understanding of the resent invention.

The looper 1 (see Fig. 1) is'provided with a thread-guiding eye 2 and islocated in position to coiiperate with the needle 3 of the sewingmachine. The looper is secured to a lever or looper ca-t-rier 4; pivotedat fi in a forked head 6 fixed to a stem Tjournaled in a portion of theframe 8 of the sewing machine. The pivot 5 and stem 7, being arrangedperpendicular to one another, permit the looper carrier 4 to oscillatein every direction, and form What may he termed a universal fulcrumjforthe looper carrier.

The cam 9, which the looper carrier and looper are actuated, is mountedupon the main shaft-1O of the machine and is rotated thereby; The cam isprovided with a peripheral 2am cam roll 12' (see Fig. 4) {on the end ofthe looper carriein The 'oove 11 and roll 1 inipart lateral oscillationsto the loo er car- V rier and looper. Thecsm is prom ed also withalateral cam g'r'oove 13 engaged b a cam roll 14 journeled'on en-arm 15'fixe to the end of the looperr carrier, and the oove 13 and roll 14impart-forward and hue word 1 movements to the looper es'rrier andlooper The-lateral sin-face of the can; in which the groove 1821s formed1s arranges"; to conform laterallyiwith the com groove 11, and

V. the peripheral surface 16 in whieh the groo vs carrier is providedwith cam 130115 17 engagingthe peripheral'surfaee 16 of the cam,

which serve to assist the cam roll 1 1 in moving the looper carrier inone direction. The cam rolls 1? are journaled'on a stem 13 passingthrough the end oflthe looper rier, and the arm 15 fixed to the stem 18.The stem 18 shd the arm 15 vented from turning by a stud -psss1 :3:through the stem 18 and pro'v'itling journal for the cam roll 12Positively setuzited looper mechanisms have previously been proposed,but in swrh "devices the mechanism has been more com pliceted than thepresent i lyention, involvmg usually the -emp10ym ent of sliliizigmovements or of other levers in addition to the si gle oscillating leverof the present invention. In the present invention the simplicity of the.SpIiDg-CSIIiLIOllBCl oscillating lever mechanism is retained, While themovements of the looper are made positive in every direction and thedisadvantages ineident tothe use of a spring are avoided.

The cam roll 14 is adequate to control the forward and. bsckwerdmovements of the looper-without the sddition of the-csm rolls oove 11'engaged by "disk 17 enfl the latter may 'oe omitted; it is preferable,however, to use the cam rolls 1! as they reduce the wear upon the camM1114.

While the present invention has been shown as appheclto'e, shoe sewingmachine of a particular type, it be apparent that .i

the improved loop-er mechanism may be ag plied "to hook-needle sewingmachines of other kinds; and while theinvehl-in has heen described inconnection with a par-- tieular embocliment thereof, it is not limiteclbroadly defined in the claims.

A loops mechanism for sewing msthereto but may be embodied in otherforms rier mounted upon a 1 iiversel fulcrum, and mechanism for impel .1compound oscillating movement to the loopcr carrier comprising twoclosed cams for: positively oscillating the looper carrier in different'dnaeoizmns, am cam rolls 'eari'lefi by the loopsr carrier and engagingthe cams, sub-' stantially as described.

2. A loopez' mechanism for'sewihg meshines, having, in mmhinstion, elooper csrrier mounted upon a 1mive1sel..'fulo1um, a. com dish haviiw aperipheral cam groove oseiliating the looper carrier in one :iisectionand a. sml cam groove for oscillatthe-looper ricer in smother clirectioncam rolls .1: eel on the looper ear-- and the cam grooves, subs .zm-'vties. he 7 looser meehenism sewing machines, having, in coznhihetiori,e loops! esp mounted on universal fulcrum a cam. for actuating thelooper carrier havperiphemlcanigroove, a, peripherai cam surface, antisisters cam groove, and

engaging he cam. surface and the cam groovessi hstsntielly as described.

- Ifi testimonv whereof I mv signature; 7

in presence of two RENRY BRIGGS.

- iss, haying, combination looper cam rolls mountedcn the loops? csrrierand

